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Battery block

a battery block and block technology, applied in the field of battery blocks, can solve the problems of abnormal heat generation, chain reaction of degradation and abnormalities of the accommodated unit cells, and the characteristic degradation of the normal unit cell also undergoes abnormalities, so as to prevent the chain reaction of degradation and abnormalities of the unit cell

Active Publication Date: 2017-01-17
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The battery block in this patent prevents damage to the battery cells caused by overheating. This means that even if one cell produces too much heat, the entire battery is protected from being affected.

Problems solved by technology

In particular, when the heat of abnormal heat generation due to an internal short circuit or other events in one unit cell is transferred to another unit cell in the module, a normal unit cell also undergoes degradation of characteristics and may cause abnormal heat generation.
As a result, this may further trigger a chain reaction of degradations and abnormalities of the accommodated unit cells.

Method used

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embodiment 1

[0101]Referring to FIGS. 1 to 6, Embodiment 1 of the present invention will be described.

[0102]First, the configuration of a battery block of Embodiment 1 will be described with reference to FIG. 1. FIG. 1(a) is a perspective view schematically showing the battery block of Embodiment 1. FIG. 1(b) is a diagram viewed from above the battery block of FIG. 1(a).

[0103]In FIGS. 1(a) and 1(b), reference sign 101 denotes a cylindrical unit cell. Unit cell 101 has a cell capacity of A (Ah). Unit cell 101 has an outer diameter of D (m). Reference sign 102 denotes a battery case for accommodating therein unit cells 101. Battery case 102 includes peripheral portion 102A and a central portion surrounded by peripheral portion 102A. A plurality of circular holes 102a are arranged at the central portion. Hole 102a has a size such that unit cell 101 can be inserted in hole 102a without difficulty. A plurality of holes 102a are arranged in a staggered arrangement in order to increase the volumetric e...

embodiment 2

[0143]Embodiment 2 will now be described with reference to FIG. 7. FIG. 7 is an enlarged top view around abnormally heated unit cell 101A in the battery block of Embodiment 2.

[0144]The battery block of this embodiment has a configuration analogous to that of Embodiment 1 except that the battery block of this embodiment does not have through hole 103. Thickness x of minimum thickness section 102b of battery case 102 in this embodiment is a thickness between unit cells 101B and 101C. Thickness x of minimum thickness section 102b in this embodiment is found using Equation 1 as with Embodiment 1.

[0145]Battery case 102 in this embodiment can be arranged such that the distances between the unit cells are reduced in comparison with the battery case in Embodiment 1. This arrangement can further improve the volumetric energy density of the battery block. As with Embodiment 1, the heat from an abnormally heated unit cell can be rapidly dispersed to the entire module without triggering abnorma...

embodiment 3

[0150]Embodiment 3 will be described with reference to FIG. 9. FIG. 9 is a diagram showing a method of manufacturing a battery case of Embodiment 3. FIG. 9(a) shows quadrilateral columnar material 110 as a rod into which one unit cell can be inserted. FIG. 9(b) is a side view showing a battery case in which quadrilateral columnar materials 110 are stacked, in view of the direction in which the unit cells are to be inserted.

[0151]As shown in FIG. 9(a), quadrilateral columnar material 110 includes: core 111 as a quadrilateral cylinder having circular hole 102a; convex portions 112 formed on the respective centers of a pair of side walls of core 111, convex portions 112 being along a longitudinal direction of core 111; concave portions 113 at which four edges of core 111 are notched along the longitudinal direction of core 111; and connection layer 106 covering core 111. Concave portion 113 is formed such that one convex portion 112 is fitted in a part configured with two concave porti...

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Abstract

The present invention provides a battery block that accommodates unit cells having higher capacities, and, even in case of abnormal heat generation in the unit cell, does not cause abnormal heat generation in the neighboring unit cells, thereby preventing a chain reaction of degradations and abnormalities of the accommodated unit cells. The battery block of the present invention includes a battery case having a minimum thickness section satisfying the relationship “K2 / K1≧K3−1”. K1 is the thermal conductance between the battery case and the unit cell. K2 is the thermal conductance of the minimum thickness section of the battery case between two neighboring holes for accommodating the respective unit cells. K3 is a ratio between the abnormal heat temperature of a reference cell and the ambient temperature causing abnormal heat generation in this cell.

Description

TECHNICAL FIELD[0001]The present invention relates to a battery block where a plurality of cells are accommodated in a battery case.BACKGROUND ART[0002]Battery blocks, each composed of a plurality of unit cells accommodated in a battery case in such a way as to allow a predetermined current to flow at a predetermined voltage, are widely used as power sources for various applications including various devices and vehicles. A recent trend is the use of technology in which battery blocks are combined into a module and different combinations of modules are used depending on different applications. Furthermore, an improvement in the performance of the unit cell reduces the module's size and weight, as well as improves the working efficiency in the assembling of a battery block. The technology of combining modules offers advantages such as improved flexibility in arranging a power source in a limited space of, for example, a vehicle.[0003]As secondary cells are improved in their performan...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01M2/02H01M2/10H01M10/6555H01M10/60H01M10/613H01M10/625H01M10/643H01M10/651H01M50/112H01M50/119H01M50/124
CPCH01M2/1094H01M10/6555H01M2/0242H01M2/0262H01M2/0267H01M2/1077Y02E60/10H01M50/112H01M50/24H01M50/124H01M50/119H01M10/658H01M10/617H01M50/102H01M50/59H01M50/20
Inventor ASAIDA, YASUHIRONISHIKAWA, YUKIOHAMADA, HIDEAKIHOSOTANI, NAOTOKISHII, DAISUKE
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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